1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /*****************************************************************************
20 * readline.c
21 ******************************************************************************/
22
23 #include <unistd.h>
24
25 /* Read line from a descriptor, byte at a time, return number of
26 characters up to the null */
27
readline(fd,ptr,maxlen)28 int readline(fd, ptr, maxlen)
29 register int fd;
30 register char *ptr;
31 register int maxlen;
32 {
33 int n, rc;
34 char c;
35 /*
36 printf("readline: fd = %d\n", fd);
37 */
38 for (n = 1; n < maxlen; n++) {
39 if ((rc = read(fd, &c, 1)) == 1) {
40 *ptr++ = c;
41 if (c == '\n')
42 break;
43 } else if (rc == 0) {
44 if (n == 1)
45 return 0; /* EOF no data read */
46 else
47 break; /* EOF, some data read */
48 } else
49 return (-1); /* error */
50 }
51 *ptr = 0;
52 return (n);
53 }
54